--- title: Substring localeTitle: 子 --- # 子 `Substring`提取字符串值的一部分。它与2个整数参数一起使用,第一个是第一个字符的位置(以索引0开头),第二个是所需的字符长度。 ## 例 ``` string firstSentence = "Apple, I have."; string secondSentence = "I have a Pen."; string apple = firstSentence.Substring(0,5); string pen = secondSentence.Substring(9,3); Console.WriteLine(apple); Console.WriteLine(pen); ``` ## 输出: ``` >Apple >Pen ```